Vacuum insulator and its assembly



Dec. sJ 1925. ,565,`152 W. G. HOUSKEEPER VACUUM INSULATOR AND ITSASSEMBLY /n venbf.- /4//7//0/77 How/keeper;

huestes Dec. s, 1925.

" f A'certain' new jand' useful Improvements in hVac'uum- Insulators andTheir Assembly, of

e 'which thefollowing is a full, clear, concise,

and exact description.

'frequency "circuits v'an'd pertains ofthe grid and anode electrodes.'.y

In' employing a vacuum tube incertain installations, particularly inhigh voltage,

high frequencycircuits, is necessary to provide special means forpreventing corona i effects along the grid and anode lead wires cathode.

`and discharges from said lead wires to the base' of the tube or to thelead -wires of the Heretofore,' attempts have been made to prevent theseeffects by surrounding the lead wires with bodies of insulating materialextending through the disc forming a portion of the base of the tube.However,

" -fin operation."

i yprove generally lupon insulating devices, .this

. the dielectric losses'due to the high voltage,

high yfrequency currentsproduced suiiicient heatin of the bodies ofinsulating material to quic ily destroytheir insulating property f andthus render the tube inoperative. l

Itis an object of this invention to provide' an insulator for'i'ise in'the base of' a high" power'vacuum-tube for 'conducting the Grid andanode lead wires therethrougliwhich will eifectively prevent dischargesfrom 'and corona-.effects along said lead wires'- and in voltage, highfrequency circitswhiclfis `simple 1n constriuition and To accomplishthese objects isu'lator. l'York, State of `New York, have invented Thisinvention relates to 'device-'s'forI insulating the conductors ofhighvoltage, high more especially to "aninsulating device adapted 'for usein'conducting through theb'ase ofl a highl power vacuum tube the lleadwires' insana PATENT @FF-ECE.

i liiinniaiu e. IiUsKE'EPEE, 0E, NEW Yom; N. Y., AssIGNoE 'ro-WESTERNELECTRIC QONPANTY, INCORPORATED, or -NEW YORK, N. Y., A coEroEA'rroN orNEW Yeux.'

" f 'vAoUUM'INsULA'roELAND :Ts ASSEN-.sniff v Application mea November2e, f is2o. serial No. 426,454.

invention comprises an evacuated closed vessel through whichi'is passeda conductor, the evacuated space poviding'the necessary in- The vesselmay be mounted wherever it is desired to utilize its insulating propertyand be' included in an electric cir- -cuit by connecting the ends ot theconductor with the conductors of the circuit, For, ex-

ample, the vessel 'may be mounted in the base ofa vacuum tube, with oneend connected to the lead wire of an electrode of the tube and theother'to a contact member.

Other objects and features oi this invention will be apparent from thefollowing specification and appended claims.

This invention will be better understood by'referenc'e to the followingspecification and accompanying-drawing wherein Figure 1 discloses avacuum tube equipped with insulators made in accordance with the.invention and Figure 2 discloses the insulator Iadapted for generaluse,

In Figure 1 the vacuum tube -comprises the Abulb-1) having a cylindricalneck 11 and a re-entrant stem l2. Encircliug the stem 12 is a metulliccollar 13 equipped with the supports 14 extendinginto the interior ofthe bulb.V Carried by the supports 14 is the cylindrical anode l5 fromwhich are-supported the blocks 16' of insulating material between whichare mounted the grid 17 and cathode 18 according to the manner dicclosedin applicants U. S. Patent No. 1,536,- 855 issued May 5, 1925.

' Extending through thesteni 12 to the end of the neck 11 aref'tlietubular members v1 9 and 20, the inner ends of which are incommunication with the interior of the' bulb.

.Arranged in said tubular 'members are the. which there will be-noinjurious heating of.; -the dielectric. l A further object-,ofthelinvention'is'to pro. vide an insulator for general"'use,'in highfigrid-and anodelead wires 21 and 22 to Qwhich are sealed the outerends ofthe said .of the bulb and cemented thereto is a metal- .flic shell-23 inthe lower end of which is .carriedthe disc 24 of insulating material-'havinga groove 24 in its periphery.` In' the arrangedfthe insulators25' which atonement-f discare provided two apertures wherein are.

at its midportion and which tapers conical-A ly toward its ends. Aflange 26is provided on the vessel wherebyfit may be located in itsaperture relative to the disc- A conduetor 27 extends through `this'vessel and is sealed in the ends thereof, one end thereo'f being adapted4to be joined to the lead wire of the grid or anode. 0n the exposed endof the vessel is provided a contact thimble 28 which is electricallyconnected with the conductor 27.' The vessel 25 is evacuated through tip29 which is sealed olf in a well-known manner. The disc 24 is alsoprovided with contact members 30 which preferably have aperturestherethrou lh to receive the lead wires 3l of the -v catho e 18, saidlead wires being enclosed in are'rst associated with the dise 24. The

25 dise is then placed -in the shell 23 adjacent'. the edge of theend'thereof which is to be cemented to the neck of the bulb with theuncapped ends ofthe vessels 25 projecting beyond said edge. `.,lllheshell is then so 30. placedrelative to thd ulb as to bring the disc intothe approximate position which -it will occupy after complete assembly,the lead wires 31 arc threaded through the contact members 80 and theexposed ends of 35 the conductors 2'? are joined to theends of vthe leadwires- 21 and .22ct the anode and grid electrodes. Then thc shell 23 isslipped along the disc 2() and onto the neck 1l to which it is cemented,after which the lower `1U end of the shell is spun into the groove A2liin the.peri1 hery of the disc 24. The lead wires 3l of the cathode 18are then soldered to the contact members 30, after which they areflushed olf even with the ends `of the contact members. This method ofassembly assures that those portions of the lead wires of thc grid andanode electrodes between the ends of the tubular niembers 19 and 20 andthe inner ends of the .in-

sulators 25 will be apln'oxinn'xtely straight.

In Figure 2 wherein the insulator is disclosed for general usedesignates a sup' port or member from which a conductor 1s 'to beinsulated, for example, a partition or the like. The vessel is of thesame configuration as 25 and is provided with a 'similar flange 34. Theconductor 35 passes through the vessel and is sealed into the outer endsthereof. O'n either end ofthe G0 vessel are provided caps 36 which areperv manently joined to vthe vessel and which are electrically connectedwith the conductor 35. These caps 'are provided with means for attachingelectric wires thereto, preferably by l having'an aperture thereinthrough which the wire may be passed and held in place by the set screw37..

. These insulators, when lused in the bases of vacuum tubes, allow the.tubes to be operated in high voltage, high frequency cir- 74'- cuits.The evacuated condition of the vessel prevents the high voltage. highfrequency circuitsl from causing a heating of the di#- Aelectric andthus preserves the insulating property thereof.

It is to be understood that. changes may be made in the structuralfeaturesof this device without in any way departing from thespirit oftheinvention as set forth in the appended claims. Y S0 What is claimedisz,

l. ln an electric discharge device,l a base,

a nnitar)v evacuated vessel of insulating material carried by said base,said vessel tapering eonically'toward the ends thereof, a S5 leading-in.wire of an electrode of the tube passingthrongh said vessel, a capmounted onone of said ends, and an electrical .connection between saidleading in wire and said eap.- 90

2. In a base for electric discharge devices, a disc,l a unitaryevacuated vessel. of insulating material mounted .in said d isc, anelectrical conductor passing through said vessel, said conductorcomprising a portion of theleading-in wire of an electrode of a vacuum.tube, a cap mounted on said vessel, and an electrical connection betweensaid. conductor and said cap.l

3. In a base for electric discharge devices, a disc having an aperturetherein, a unitary evacuated vessel having a cylindrical portion andcon-ical ends arranged with its cylindrical portion in said'apertnre, anelectrical conductor passingthrough said vessel and sealed into the.ends of the conical portions, said conductor comprising a portion of theleading-in wire`of an electrode of a vacuum tube, a cap mounted on oneend of said vessel, and an electrical connection between said c'ap andsaid conductor.

4t.. In a base for electric discharge devices,

a disc having an aperture therein, a unitary evacuated vessel having a.cylindrical lluidportion and conical ends arranged with its cylindricalportion in said aperture, a flange on said cylindrical portion to engagesaid disc to position said vessel .relative to said dise, an electricalconductor passing throu h said vessel-and sealed into the ends of Siecorneal portions, said conductor comprisi g a portion ofthe leading-inwire for an el c-. trede of a vacuum tube, a cap mounted im one endv ofsaid vessel, and an electrical edn- 12 nection between said cap and saidconductor.

5. A device' of the character described comprising. a unitary -evacuatedvessel of insulating material, an electrical conduc r passing throughand sealed 4in a wall of s id 130.

.vcsSeL a cap carried by said vessel, said cap being electricallyconnected-With said conductor and formi-ng a terminal.

G. A device of the character described, comprising a unitary evacuatedvessel of in.- sulating' material, said -vessel ,having a substantiallycylindrical member havingconi- Vcial ends, a flange around themidportion of 1 L said vessel, a metallic cap on one of said' conicalends and a conductor passing through said vessel, s, id conductor beingelectrically connected to said cap.

In witness whereof, 1 hereunto subscribe my naine this 18th day ofNovember A. D.,

WILLIAM G. HOUSKEEPER.

